Improvement in auger-bits



Www www W. A. Ives, oF NEW HAVEN, CONNECTICUT.

Letters Patent No. 90,755, dated .Tune 1, 1869.

IMPROVEMENT 1N AUG-ER-BITS.

The Schedule referred to in these Lettexs Patent and making part o! thesame.

To all whom me@ concern .f

Be it known thatv'l, W. A. Ivns, of New Hoven.

y the county of New Haven, and State of Connecticut, have invented a.new Improvement. in Auger- Bits; and I do hereby declare the following,when taken in connection with the accompanying drawings, and the lettersof reference marked thereon, t-o be a full, clear, and exactdesci'iption of the same, and

which said drawings constitute part of this specificai- .in aspur-cutter, the screw being in the cutter` between.

In order to the clear understanding of my invention, I will fullydescribe the saine as illustrated iu the accompanying drawings. f

A represents a. portion of an auger-bit, formed in the usual manner.`One of the twists terminates in a floor-lip, a, the

other in a spur-cutter, d, that twist being brought` down so that thespur-cutter will stand perpendicular, or nearly so, as seen in fig. 3,and the cutter is formed by taking out or forming a recess, b, betweenthe edge of the twist und the centre, as seen in fig. 1. Central betweenthe two, a common screw-point is formed.

The advantages of this vconstruction 'are- First, that the door-lip,which is but a. termination of the twist upon which it is formed, may beeasily filed or cut away to slim-pen the cutter.

Secondly, the labor in its construction is less than either for a centreor auger-bit, and all thc advantages of both are combined in one.

Having fully described my invention,

What I claim as new and useful, and desire to secure by Letters Patent,is-

In double-twist auger-bits, forming a floor-lip, a, upon one twist, andthe other twist terminating in the spur-cutter d, and so as to forniarecess between the s aid spur and the centrescrew, substantiallyasspecified.

W.\A. IVES. \Vitnesses JOHN E. EARLE,

Jenn H. SHUMwAv.

